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(No Model.) 2 Sheets-Sheet 1;

G. HUGHES.

GRINDING AND MIXING MILL. I No. 394,771. Patenug ed Dec. 18

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N. PETERS. PhuXa-Liflwgraphcr, Wnhingion. D.C.

(No Model.) I 2 Sheets-'Shee.t 2.

G. HUGHES.

GRINDING AND MIXING MILL.

Patented Dec. 18 1888.

II lllllll l Ilrrno STATES GEORGE HUGHES, OF IVASHINGTON, DISTRICT OF COLUMBIA.

GRINDING AND MIXING MILL.

SPECIFICATION forming part of Letters Patent No. 394,771, dated December 18, 1888.

Application filed June 22, 1 88 8.

To all whom it may concern:

Be it known that I, GEORGE HUGHES, of the city of \Vashington, in the District of Columbia, have invented certain new and useful Improvements in Grinding and Mixing Mills, of which the following is a specification, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of my invention is to provide a mill that can be easily adjusted to grind and mix materials of different degrees of fineness, and particularly adapted for preparing mortar and concrete. It may, however, be used for grinding and mixing paint or the like. By its use I propose to utilize material which has heretofore been comparatively worthless such as soft-stone chippingsas a substitute for or addition to sand in mixing mortar. Ashes can also be advantageously used for the same purpose. Furthermore, the material for concrctesuch as brick, stone, &c.can be broken into suitable size and discharged directly to be mixed with the lime and cement.

My invention consists in the several details of construction and arrangement hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a front elevation, partly broken away, of a mill embodying my improvements. Fig. 2 is a vertical section through the line 5c of Fig. 1. Fig. 3 is a side View. Fig. 4 is a horizontal section, and Fig. 5 a detail.

Similar letters of reference represent similar parts in the respective figures.

A is the bed or foundation of the machine, which may be of heavy timber, masonry, or other construction.

B B represent the main housing or posts of the mill, made, preferably, of cast-iron and of suitable strength, and B "3 are braces.

(J is a cross-beam or casting, which ties the two posts B B together. The table or revolving bed upon which the materials are ground is represented by D, it being provided with a central shaft, a, which has its upper bearing in the cross-beam O. The upper end of the shaft a projects above the beam 0 and is screw-threadedjor the reception of the nut a, for the purpose of partially supporting the Serial No. 277,862. (No model.)

weight of the table and its contents and lessening the friction upon the drivingshaft. The table or bed D is made of cast-iron, and with a wall, (Z, around its periphery of suitable depth. The wall is made inwardly slanting, as shown in the drawings, for a purpose hereinafter specified. I prefer to provide the table or bed with a false bottom, d, of castiron, made in two sections, so as to be readily inserted and to fit around the central shaft, a. The periphery of the table is provided with hinged portions (Z the bottoms of which are flush with the top of the false bottom, and which, when let down, as shown in Fig. 2, allow the contents of the table to be dis charged.

The posts B B are each provided with a slot, 1), in which rests a squared end of the axle E, whereon are mounted the grinding or pulverizing rolls E. These rolls are of castiron and hollow, being filled with concrete or other material to give them the requisite weight. The axle is perforated centrally for the reception of the shaft a, the axle serving to a certain extent as a lower bearing for the shaft. At the lower end of the shaft to, or where it unites with the table, is placed a scraper, consisting, preferably, of two separate wings, F, as shown in Fig. 4:. The scraper may, however, be differently arranged, provided it shall rest in close proximity to the table. The wings F are each supported by an upright post, 0, secured to the axle and partake of the vertical movement of which the rolls are capable. The under side of the table D is provided with teeth (1 which engage with a pinion, G, mounted upon the sh aft 6, carried by the posts B, and having a driving-pulley, f. Upon the shaft 6 is mounted a loose wheel, H, which serves as a support to the table or bed, equalizes the strain upon the gearing, and prevents the binding thereof which would occur were the table not maintained in a horizontal position. The table is strengthened on its under side by suitable ribs.

G, G, G and G are shafts having their ends squared and supported in suitable housings on the posts B, those supporting the shafts G G permitting them to be adjusted both vertically and laterally, for a purpose hereinafter specified. The shafts carry the corrugated rollers g g, g g, g and 51 g, which revolve on them. These rollers are arranged in pairs, as shown, those carried by the shafts G G being nearer to each other than those on the shafts G G, in order that they may still further reduce the material which passes between them from the upper rollers. The rollers of each pair of shafts are given the necessary reverse movement with respect to their follows by means of the cross belts g, which pass over pulleys integral with or rigidly eonnectedto the rollers. Motion is imparted to the upper corrugated rollers by means of the belts H II, which pass around the pulleys h 71, mounted on the driving-shaft e, and also around the pulleys h h of the rollers 011 either of the upper shafts. The lower set of corrugated rollers are revolved by means of the gear-wheels I, rigidly connected to the outer faces of the pulverizingrolls E, and which engage the gear-wheels I, rigidly attached to two of the rollers, one on each shaft and diagonal to each other.

IVhile I have illustrated and described a system of belts and pulleys to operate the corrugated rollers, it is obviousthat sprocketwheels and chains may sometimes be advantageously substituted without departing from the spirit of my invention.

J J are hoppers supported by the hangers j, attached to the cross-beam C and arranged immediately over the corrugated rollers.

K K are belts provided with buckets 7.; and running over the pulleys 7t" and k mounted in suitable bearings supported, respectively, by the cross-beam C and the lower part of the frame. These carrier-belts are for the purpose of elevating the material to be crushed from the lower hoppers, L, to the hoppers J, whence it is fed to the corrugated rollers. The carrier-belts are driven by belts running from the driving-shaft e to the pulleys k M M are screens supported in any suitable manner by the frame and for the purpose of preventin the crushed material falling outside the table D after it leaves the lower corrugated rollers.

L is a scraper attached to the vertical red I, which slides in bearings in the axle E and cross-beam The upper end of the rod Z is connected to the pivoted lever l, operated by means of the chain. 1 \Vhile the material is being pulverized on the table, the scraper L is held in the position shown in Fig. 1. \Vhen, however, it is desired to discharge the material from the table, the chain Z is re leased from the catch Z and the scraper will fall by its gravity to the position shown in Fig. The hinged portions (1 will be let down, and as the table continues to revolve the material will be banked up against the scraper L and discharged through the open,- ings in the periphery of the table.

In operation, when it is required to grind and mixmortar, the rollers E rest on the bed. of the table I), and it soft stone is to be used as a substitute for or addition to the sand it is carried up by the carrier-belts K to the hoppers J and crushed between the corrugated rollers, the upper rollers being arranged about two inches apart and the lower ones about one inch apart. It then falls onto the table I), and will be pulverized and thoroughly mixed with the lime by means of the rollers E, the scrapers 11 serving to constantly turn the mass over and force it under the rollers E as the table is revolved. \Vhcn thoroughly mixed, the scraper L is lowered and the hinged portions (1 are let down, when, the table constantly revolving, the mass will be banked up against the scraper L and discharged, as hereinbetore stated.

The operation is the same in grinding and mixing paint.

\Vhen the mill is to be used for preparing concrete, the axle E is elevated by means of the levers 17, and blocks 11 are inserted under the ends in the slots 1), as shown in Fig. 5, to support it and keep the rollers E at the necessary height-say one (nd a half or two inches above the bottom of the table. The lower corrugated rollers must also be elevated to the same extent and supported in a similar manner. The upper rollers need not be moved, as they are sufficiently above the lower ones to allow of this vertical adjustment. The lower corrugated rollers can also be adjusted laterally, so as to have a space of one and a halt to two inches between them, according to the predetermined size of the pieces of brick and stone for the concrete. The said rollers are held in such po sition by means of blocks 11 the set-screws 11 serving to hold them steady in whatever position they are vertically adjusted. The operation will then be similar to that already described for mixin mortar.

llaving described my invention, I claim- 1. The combination,with the revolvingbed or table, of the vertically-ad;justable rolls traveling thereon, and the upper and lower pairs of corrugated rollers arranged above the rolls, the lower pairs of said rollers being vertically and laterally adjustable, substantially as set forth.

2. In a mill, the combination, with the revolving table, the rolls traveling thereon, and the corrugated rollers arranged above said rolls, of screens supported by the frame of the mill to prevent material after passing between the rollers :t'rom tallin outside the table, substantially as specified.

3. In a mill, the combination, with the main housings or posts B 1-3 and the crossbeam 0, of a driving-shaft, 0, carried by the posts I B, a loose wheel, II, and a toothed pinion, G, mounted on said shaft, and arevolving table provided. with a central supportingshaft which passes through the cross-beam G and is screw-threaded for the reception of a nut which rests on said cross-beam, the said table being provided with teeth on its under side, which engage with the pinion G and the loose Wheel H, serving to .keep the table in a horizontal position, substantially as specified.

In testimony whereof I have hereunto set my hand and seal.

GEORGE HUGHES. [L. s]

Witnesses:

E. URUSE, PHILIP MAURO. 

